The U.S. International Trade Commission upheld a judge’s findings that neither Apple nor RIM violated Kodak’s rights in the patent. The commissionsaidit agreed with the judge that the patent claim was invalid. Its reasons for the decision will be released once both sides have a chance to redact confidential information.

Kodak has been seeking a victory to force Apple and RIM to pay licensing fees and bolster the value of the patent portfolios Kodak intends to sell. Kodak said in a court filing that Apple alone owes more than $1 billion in royalties. The dispute has dragged on for about 30 months, almost twice as long as a typical ITC case.

The patent’s validity “has been upheld in previous litigation at the ITC, and was affirmed by the U.S. Patent and Trade Office in the face of two separate challenges, so we are confident that its validity will ultimately be upheld,” Chris Veronda, a spokesman for Kodak, said in a statement.

Kristin Huguet, a spokeswoman for Apple, said the company had no comment.

The patent in the case is in one of two portfolios that Kodak is selling, which may be its most valuable assets. One group includes patents for digital-capture technology and the other covers imaging systems and services.